The following memory leak can be observed when the controller supports
codecs which are stored in local_codecs list but the elements are never
freed:

unreferenced object 0xffff88800221d840 (size 32):
  comm "kworker/u3:0", pid 36, jiffies 4294898739 (age 127.060s)
  hex dump (first 32 bytes):
    f8 d3 02 03 80 88 ff ff 80 d8 21 02 80 88 ff ff  ..........!.....
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffb324f557>] __kmalloc+0x47/0x120
    [<ffffffffb39ef37d>] hci_codec_list_add.isra.0+0x2d/0x160
    [<ffffffffb39ef643>] hci_read_codec_capabilities+0x183/0x270
    [<ffffffffb39ef9ab>] hci_read_supported_codecs+0x1bb/0x2d0
    [<ffffffffb39f162e>] hci_read_local_codecs_sync+0x3e/0x60
    [<ffffffffb39ff1b3>] hci_dev_open_sync+0x943/0x11e0
    [<ffffffffb396d55d>] hci_power_on+0x10d/0x3f0
    [<ffffffffb30c99b4>] process_one_work+0x404/0x800
    [<ffffffffb30ca134>] worker_thread+0x374/0x670
    [<ffffffffb30d9108>] kthread+0x188/0x1c0
    [<ffffffffb304db6b>] ret_from_fork+0x2b/0x50
    [<ffffffffb300206a>] ret_from_fork_asm+0x1a/0x30

Cc: stable@vger.kernel.org
Fixes: 8961987f ("Bluetooth: Enumerate local supported codec and cache details")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>